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The country's Football Association (CFA) is proposing the measure for loss-making clubs in order to try to curb the league's extravagant spending.
Chinese clubs spent £331m during the country's winter transfer window, which was more than their English Premier League counterparts in January.
The proceeds from the tax would go into a government-run fund.
If enforced, the measure would in effect double the fee for any player.
Manchester United striker Wayne Rooney and Chelsea striker Diego Costa are among the high-profile players to be linked with the Chinese Super League (CSL), with the transfer window open until 14 July.
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In the last transfer window, Shanghai SIPG bought Brazil international Oscar for £60m from Chelsea, while Shanghai Shenhua spent £40m on Carlos Tevez. The Argentina striker signed a deal worth a reported £310,000 a week.
At the time, a spokesperson for China's General Administration of Sport said clubs in the country were "burning money".
Limits on the number foreign players in squads were put in place for the current season, which runs from March to November. Only three non-Chinese players can now be fielded in a fixture in a move the CFA hoped would tackle "irrational" spending.
Costa was a target for Tianjin Quanjian but the club's owner, Shu Yuhui, said in January that a bid to sign the forward had been scuppered by new CSL rules limiting the number of foreign players.
In each game next year, clubs will also have to field as many Chinese under-23 players as overseas players.
BBC Sport's Simon Stone:
The Chinese Super League transfer window has raised the potential for another massive deal being done for Wayne Rooney.
A move to China is one of a number of options for Rooney, which also include remaining at United for the final year of his contract.
However, he may wish to consider the fate of former team-mate Carlos Tevez, who joined Shanghai Shenhua on a mega deal earlier in the year.
Neither the team nor Tevez are performing to expectations and when the Argentina international was spotted at a theme park after missing a game through injury this weekend, fans went on social media to condemn him, with one saying he has "the worst attitude in the team's history".
Big money. Big demands.
Chinese Super League clubs face a 100% tax on signings as their mid-season transfer window opens on Monday.

The charges come after the pair were involved in a confrontation near the end of the Terriers' 2-1 win on Sunday.
In addition, both clubs have been charged with failing to ensure their players 'conducted themselves in an orderly fashion'.
The clubs have until 18:00 GMT on Friday to respond to the charges.
Monk accused Wagner of lacking "class, humility and respect" after the pair were sent off, having clashed in the aftermath of Huddersfield's winning goal.
The Huddersfield boss sprinted down the touchline to join his players in celebrating Michael Hefele's 89th-minute goal and the pair tussled when the German was returning to his technical area.
Meanwhile, Huddersfield have indefinitely banned a supporter who unfurled a Turkish flag during the game.
Two Leeds fans, Christopher Loftus and Kevin Speight, were murdered before a match against Galatasaray in Istanbul in April 2000.
Huddersfield said in a statement: "Huddersfield Town can confirm that a 59-year-old man was ejected from the Revell Ward Stand at Sunday's game against Leeds United. The individual has been banned from the John Smith's Stadium indefinitely.
"Huddersfield Town takes incidents of this nature very seriously and will not tolerate this shameful behaviour under any circumstances. This individual is not representative of the club or its supporters."
Huddersfield boss David Wagner and Leeds counterpart Garry Monk have been charged with improper conduct by the Football Association.

During a visit to Aberdeen, he said the money would be used for further exploration, innovation, and skills development.
The package is in addition to the £504m announced earlier by the UK and Scottish governments.
That will be ploughed into improving the North East's infrastructure over the next 10 years.
The region has felt the brunt of a global fall in oil prices.
The cost of a barrel of Brent crude oil has decreased from more than $100 in January 2014 to less than $30 in January of this year.
During Prime Minister's Questions at Westminster on Wednesday, Mr Cameron said that the industry was facing significant problems.
He added that his government was "determined to help".
Separately, Scotland's First Minister Nicola Sturgeon has called on the UK Chancellor George Osborne to cut North Sea taxes.
Following news of the £20m fund, the UK's biggest offshore trade union, Unite, called on Mr Cameron to clarify the UK government's long-term plan for the oil and gas sector.
It said there had been more than 65,000 jobs lost in the last year and "turbulent market conditions" were continuing.
Unite's Scottish secretary Pat Rafferty said: "We are pleased that our political leaders are recognising the severity of the situation and investing in the north east economy, which has been hammered by the oil price slump.
"We've also heard calls from the Scottish government for further tax breaks for the offshore industry, but workers now need clarity from the prime minster about how he intends to safeguard employment, skills and also occupational safety."
He added that the workforce must be the "biggest beneficiaries" of all future investments and tax breaks.

Prime Minister David Cameron has announced a £20m funding package to help the North Sea oil and gas sector.

